<div id="fixtool">
    <div class="oper" data-bind="click:handlePlus">+</div>
    <div data-bind="text:rate() + '%'"></div>
    <div class="oper" data-bind="click:handleMinus">-</div>

</div>
<style>
    #fixtool{
        position: fixed;
        bottom: 50px;
        right: 20px;
        -webkit-touch-callout: none; /* iOS Safari */
        -webkit-user-select: none; /* Chrome/Safari/Opera */
        -khtml-user-select: none; /* Konqueror */
        -moz-user-select: none; /* Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
        user-select: none; /* Non-prefixed version, currentlynot supported by any browser */
    }
    #fixtool .oper{
        width: 30px;
        height: 30px;
        line-height: 30px;
        font-size: 18px;
        text-align: center;
        cursor: pointer;
        background-color: #FFF;
        margin: 5px 0;
        box-shadow: 0 1px 6px rgba(0,0,0,.2);
    }
    #fixtool .oper:hover{
        background-color: #EEE;
    }
    ,#fixtool .oper:active{
         background-color: #FFF;
     }

</style>